Thermostat



(No Model) 0. WIEDERHOLD.

THERMOSTAT.

N0. 586,301. Patented July 13, 1897.

WITNESSES: INVENTOB a flaw-41 ATTORNEYS OSCAR \VIEDERIIOLD, OI" SUMMIT,NEIV JERSEY.

TH ERMOSTAT.

.PEC-IFILGA'I'IGN forming part Of Letters Iatent NO. 586,301, dated July13, 1897.

Application filed November 14, 1896, Serial No. 612,056, (No model) T0aZZ whom it may concern:

Be it known that I, OSCAR \VIEDERHOLD, a resident of Summit, Unioncounty, State of New Jersey, have invented certain new and usefulImprovements in Thermostats and 'lhermostatic Alarm Arrangements, ofwhich the following is a specification.

My invention relates to thermostats and thern'iostatic alarmarrangements particularly applicable to dynainos and motors.

My invention will be understood by referring to the accompanyingdrawings, wherein I have illustrated a thermostat embodying myinvention.

In the said accompanyin drawings, Eigu re 1 illustrates in face view athermostat with the face-plate removed and connected to an annunciatorapparatus. Fig. 2 is a section on line 2 of Fig. 1.

In the drawings, A represents the back plate of the thermostat, B theside Wall, and G the front plate thereof. Passing from the back to thefront plate is a tube D. Coiled around the tube D and having one endinserted in the said tube, in order to perfect an electrical contacttherewith, is a thermostatic coil E, having a contact 8 on its free end,which contact c is adapted to contact with a contact a, carried upon acontact-adjusting arm b,which passes around a post cin a loop, (so as topivot the arm,) as will be clearly seen in Fig. 2, and having a handleb',which enters notches in a scale F. The screw 0 and scale F aresuitablysecured to the back plate of the thermostat and insulatedtherefrom. By swinging the contact-adjusting arm I) on its pivot thecontact a may be brought near to or far away from the contact e, so asto regulate the instrument to close the circuit at a predetermineddegree of heat. The tl1ermostatic coil, as aforesaid, is electricallyconnected to the tube D,which forms part of the casing or walls of theinstrument, to which walls or one of them a binding-post (Z iselectrically connected. Another binding-post f 4 is mounted upon one ofthe walls of the instrument, but insulated from the said wall andconnected by a wire 9 to the contact-adjusting arm Z). The circuitthrough the instrument will be obvious without further de- 5 scription.These thermostats are especially adapted for use in locations whereheated air flows, and are placed in such a position that the heated airwill pass through the passage in the tube D, and as soon as this airbecomes 5 too highly heated the thermostatic coil E brings its terminal6 against the terminal a and closing the circuit may give an alarm.

Having described my invention and the principle thereof and the bestmode in which 6 I contemplate applying that principle so as todistinguish it from other inventions, I declare that what I claim, anddesire to secure by Letters Patent, is-

1. In a thermostat, thecombination of a 6 thermostatic coil E carrying acontact 0, a contact-adjusting arm also carrying a contact and a notchedscale receiving the con tact-adj usting arm in the notches thereof andindicating the position of the said arm,where- 7 by the thermostat maybe set for a predetermined degree of heat.

2. The combination of an enveloping casing, a tube extending from. sideto side of the said casin g and constituting the wall of a 1311- 7 bularpassage through the thermostat, a thermostatic coil wholly containedwithin the said enveloping casing and closely surrounding the said tubeand provided with a contact and a pivoted contact-arm within the casingand 8 cooperating with the contact of the thermostatic coil.

OSOAB. WIEDERHOLD. Witnesses:

MAURICE BLocK, ISAAC A. Lnvv.

